louis



uiten J; DEAN, or sfr. LOUIS, MIssr0'URI.

Lettersilateat No. 71,144, dated November 19, 1867.

y jmraovrmrur'm 'russ-WELLS-' tite' Srtzlmlt atmet-tr in tbese'etters tant 'aut' mating giri nf its same.

TO ALL VlHOM IT MAY CONCERN: i. l

Be it known' that I, T. J. DEAN, of St. Louis, inthe county of St. Jmuis, and State of Missouri, have made certain new and useful Improvements in Wells; a'nd I do hereby declare that thefollowing is a fulland clear description thereofreference beinghad to the accompanying drawings, and to tho letters of reference marked thereon.

The object of this invention is to construct awell in such a manner; as to free the water drawn from it from mechanical impurities, by filtering, before it is drawn from'the well. This is most readily accomplished by using the driven wells, that is, the wells constructed by driving a pipe (having its lower end perforated) down into the ground. When .this kind of a well is used, I surround the lower end. of the tube with acylindricalcasing, also perforated; but this outer casing vshould be of two or -three times the diameter of the inner or welltube, thus leaving an annular chamber between'the two, and this annular chamber is to be filled withvsome kind o'fa iilter ing material. When. the well is dug or bored, the bottom part of the wall of the well may form the exterior tubing; When the well is driven-there are some other details necessary, which will be more, fully understood by reference to the following description, which will enable those skilled in the artto make and use my.

improved wells; i

Figure I of. the drawings is a. side .elevation of one of the improved wells formed by tubing. Figure 2l is a horizontal section taken on the line -q/ of iig. 1.

Figure 3 is a sectional elevation of the same.

The tube A is to have a pointed, solidE end, A', in the same manner that the solid points were aixed to the ordinary tubes of the drivenl wells, except in this instance the point A will he much larger in diameter than the points hitherto used for such purposes, it being necessary for the present purpose to make the point, at its upper end, two or three times the diameter of the .tube A. To fthe top end ofthe point-piece Aiis securely axed the 'bottom end of the cylindrical casing B, which'is to beof a diameter equal to the diameter of the top end of thepointfpiece. This casing is to be, say, three or four .feet long, (more 'or less,) and is to be perforated with numerous'holes, of, say, a`quarter to a half-inch in diameter It will enclose between it and the tube A an annular chamber, ,0, of, say, two to six inches width, (more `or less,) and-this chamber is to be closed at its top end by the annular plug B', which is to be secured to the top. end of the cylinder A. The enclosed end of the tube A is to be pierced with holes, a, corresponding in size to the holes b. In the annular chamber C, Y which is thus formed, are to be placed two concentric strainers, c c', the strainer c being placed close to the inner -side of the casing B, andthe strainerl c close to the outer side of the tubeA. Between. these strainers,. y thus located, is to be introducedl some ltering material, as,y for instance, coarse gravel or sand, or any ether material that may be suitable for the purpose. The enlarged end, formed by the cylinder '.B, will ferm such aul enlarged orice while being-driven into the ground as td avoid much friction on the sides of the tube A, and the driving will consequently be easier than 'whenn small point is used. When the well is bored or` dug', thecylinder B may b e dispensed with. l Y 4 Having described my invention, what I claim, is A tube-well, its lower section' consisting of two concentric perforated tubes, one wire-gauze tube surroundingthe interior perforated tube, and another lining the 'exterior perforated-tube, a' bodyV of filtering material being placed between-.thc two tubes of gauze, all substantially as shownand described.

T. JQDEAN. Witnesses:

Gao. I.- Hsarnnr., Jr.,

- H. PAUL. 

